Version 0.4

Modifies:
1. Add a shortcut key <Leader>s to go to signed error
2. Optimized to be faster
Version 0.5

1. Show a hint message instead of error/warning message if error/warning message is too long. You can custumize your longest length.
Version 0.6: Now you can check errors in quickfix window
Version 1.1

1.Fix A bug which may cause vim crash
2.Optimized for better performance